Table 5.

Binary logistic regression was performed to proof the association of correct measurement of the tumor stage (accordance) with tumor size cT, cN, BMI, age, grading, histology, Ki67 in HER2 positive tumors

	Odds ratio	95% Confidence interval	p
Clinical tumor stage cT	1.54	(0.81–2.93)	0.19
Clinical tumor stage cN (cN0 vs. cN +)	0.72	(0.22–2.40)	0.59
BMI	1.06	(0.92–1.23)	0.42
Age	0.98	(0.94–1.02)	0.23
Grading			0.95
G1	–	–	–
G2	1.20	(0.39–3.66)	0.75
G3 (served as reference category)
Histology			0.90
NST (served as reference category)
Invasive lobular	1.67	(0.19–14.94)	0.65
Other	–	–	–
Ki67	1.00	(0.97—1.04)	0.82

All variables were tested in univariable binary logistic regression first, as no variable provided statistical significance, no multiple analysis was performed